- (301) 829-0060
- Mt. Airy, MD
- info@pestshieldinc.com
Pest Shield, Inc. has provided mouse control and general pest management across Frederick County since 2011, holding Maryland pest control license MDA #30263 and employing a team with over 75 years of combined pest management experience. Owner Troy Yowell brings approximately 35 years of hands-on experience to every job, and the company’s staff includes Jeffrey Allwine, a certified entomologist who supports species identification and diagnostic work when field assessment needs a second layer of confirmation. Pest Shield has earned 338+ five-star reviews across Google and HomeAdvisor — a record built on honest assessments and treatments that actually work, not on upselling services homeowners don’t need.
How it works
Four steps. No surprises. Same answer whether it's your first call or your tenth.
You reach Troy or someone on his team directly. No call center, no dispatcher, no routing.
Same-day or next-day for most calls. Emergency stinging-insect situations and real-estate WDI deadlines get priority.
We identify the species, locate entry points, and find the source — not just the symptom.
Written recommendation, straightforward pricing, no obligation. If you don't need treatment, we'll tell you.
Most Brunswick homeowners don’t see a mouse before they see what a mouse leaves behind. By the time the evidence is obvious, the colony is usually established — which is why recognizing the early signs matters.
Brunswick’s older housing stock amplifies these risks. Many homes in the town’s historic core were built in the late 19th and early 20th centuries — originally constructed for railroad workers — and feature stone foundations, crawl spaces, and aging siding details that give mice far more entry opportunities than newer construction. A gap as small as a quarter inch is enough for a house mouse to pass through, and older homes accumulate those gaps over decades of settling, weathering, and deferred maintenance.
Fall and winter are peak intrusion season as mice seek warmth when temperatures drop, but that seasonal pressure doesn’t mean the problem resolves on its own in spring. Established colonies persist year-round. A mouse family that moves in during October and isn’t addressed will still be there — and larger — by April. Hardware store traps and bait blocks can reduce visible activity temporarily, but they don’t address how mice are getting in or eliminate the colony at its source, which is why the same homes tend to see the problem return season after season.
The health and structural risks are real without being dramatic about them. Mouse droppings and urine can carry hantavirus and salmonella, and dried droppings become airborne particulate in enclosed spaces like attics and crawl spaces. Gnawed electrical wiring is a documented fire risk. These aren’t reasons to panic — they’re reasons to address the problem thoroughly rather than partially.
60+ years of combined experience. Tell us what you’re seeing — we’ll come look, no obligation.
Troy resolved my pest issue in a very timely manner, which is important to me, as I have children in the home. He was very thorough in explaining his process before he took action so I knew what to expect. I have not had any pest issues since, and I am glad I made that call to Pest Shield.
mark kimball · January 2014 Read on HomeAdvisor →
Troy was very knowledgeable, professional, courteous, and prompt. They eliminated my mice problem and came out for follow up visit to seal off any entry points from outside. Very reasonably priced for the service provided. Used top notch products, instead of just sitting out glue traps. Highly recommend them.
Kevin Smith · February 2016 Read on HomeAdvisor →
Mice!! We moved into our new home only to find it infested with mice. Contacted Home Advisor and they sent me Troy from Pest Shield and less than 30 days later…..no mice. Troy is a very geniuine and honest guy. He wont try to over-sell you on things that you don’t need and his goal is to rid you of the problem ASAP. He was very prompt and followed up as promised 30 days after the first visit. Prices are reasonable and his services for mice were covered for a full year with one payment. Look no further, these are the guys you want taking care of your pest!! Thanks Troy!!!
Robert R · March 2014 Read on HomeAdvisor →
General pest & rodent control
Pest Shield’s approach to mouse control starts with an inspection, not a treatment. Troy or one of the technicians walks the property — exterior and interior — to identify how mice are getting in, where they’re active, and what conditions are making the home attractive. That assessment drives the treatment plan. There’s no standard package applied to every house; the entry points on a stone-foundation home near the Potomac corridor are different from those on a 1970s split-level, and the treatment reflects that.
The core methodology is exterior-first. As one long-term Pest Shield customer put it: “Pest Shield treats your house primarily from the outside to prevent pests from ever getting into your house and keeps the chemicals out of your home, protecting your family.” Rather than placing glue traps inside and calling it done, Pest Shield uses professional-grade baiting — the kind of targeted, high-efficacy products that interrupt the colony rather than just catching individual mice at the surface. Interior treatment is applied when the situation warrants it, but the exterior perimeter is where the work happens.
A follow-up visit is scheduled after initial treatment — typically around 30 days — to confirm results and, where appropriate, seal identified entry points from the outside. That follow-up isn’t an upsell; it’s part of how the service is structured. Pest Shield has been documented multiple times arriving at follow-up visits, refreshing bait stations where needed, and not closing the job until the problem is actually resolved.
For Brunswick homes with recurring pressure — older construction, wooded lots, proximity to agricultural fields — the initial treatment is often paired with Pest Shield’s Standard Care Plan: treatment every 60 days on a bi-monthly cadence, complete exterior treatment focus, and a 100% effective guarantee with free retreatment between scheduled visits if mouse activity reappears. The plan doesn’t require you to be home for treatment. It’s offered when it genuinely fits the situation — Pest Shield has a well-documented pattern of recommending against ongoing service when a one-time treatment will do the job.
Products used are EPA-approved, and nontoxic options are available for homes with children and pets. Pest Shield has treated homes with crawling infants, immunocompromised children, and multiple dogs — the exterior-first approach keeps chemical exposure inside the home minimal by design. If you have specific concerns about what’s being used and where, Troy will address them directly before any treatment begins.
To schedule a free inspection or ask about same-day availability in Brunswick, call (301) 829-0060 or submit a request online. The inspection is no-cost and no-obligation — it starts with an honest look at what’s actually happening.
Owner
Founded Pest Shield in 2011 after years as a pest management contractor on U.S. military bases in Iraq and Afghanistan. Around 35 years in pest management. Personally handles or leads the majority of service calls.
Pest Management Specialist
Field technician handling residential and commercial service calls across Frederick, Carroll, and Montgomery counties.
Pest Management Specialist
Field technician handling residential and commercial service calls across the service area.
Our Entomologist
Consulting entomologist on species identification, conducive conditions, and treatment strategy for difficult cases.
Brunswick sits at the southwestern edge of Frederick County along the Potomac River, connected to the broader county via MD Route 17 and US Route 340. The town is bordered by agricultural land to the north and west, and the C&O Canal corridor runs along its southern edge. That combination — river bottomland, active farmland, and a compact residential core — creates year-round rodent pressure that intensifies sharply each fall as field mice and house mice migrate toward structures when crops are harvested and temperatures drop. Homeowners dealing with this recurring pressure often benefit from pest control in Brunswick that addresses the full range of seasonal invaders alongside mice.
Brunswick’s historic residential neighborhoods, many developed in the late 1800s and early 1900s to house B&O Railroad workers, feature the construction details that mice exploit most readily: stone and brick foundations with mortar gaps, crawl spaces with aging vapor barriers, and older wood-frame siding that has shifted and settled over a century of use. These aren’t defects — they’re characteristics of older construction that require a different inspection approach than newer homes. The same structural vulnerabilities that let mice in can also invite rat activity in Brunswick, particularly in crawl spaces and along the foundation perimeter. Pest Shield serves Brunswick as part of its Frederick County coverage area, with the same same-day response capability documented across the region.
It depends on the property and the source of the pressure. For some Brunswick homes — particularly newer construction with fewer structural vulnerabilities — a single treatment with a follow-up visit to confirm results and seal entry points is sufficient. For homes with older foundations, crawl spaces, or proximity to agricultural fields, recurring mouse pressure is the norm, and one treatment addresses the current colony without eliminating the conditions that attract mice in the first place. In those cases, Pest Shield’s Standard Care Plan — treatment every 60 days, exterior-focused, with a 100% effective guarantee and free retreatment between visits if mice reappear — is the practical answer. Troy will tell you honestly which situation you’re in after the inspection; Pest Shield has a documented pattern of recommending against ongoing service when it isn’t warranted.
House mice (Mus musculus) can pass through a gap as small as a quarter inch, and Brunswick’s older homes — stone foundations, aging siding, crawl space vents, utility penetrations — provide plenty of them. Common entry points include gaps where pipes or conduit enter the foundation, deteriorated crawl space screens, spaces under garage doors, and areas where siding has pulled away from trim. Pest Shield’s inspection identifies how mice are getting in, not just where they’re active inside. Entry point sealing is performed as a follow-up service after initial treatment confirms results — the technician returns to seal identified gaps from the outside, which is part of how the service is structured rather than an add-on.
Yes. Pest Shield uses EPA-approved products and offers nontoxic options for homes with children and pets. The exterior-first treatment approach keeps chemical application outside the home by design — interior treatment is used only when the situation specifically calls for it. Pest Shield has treated homes with crawling infants, immunocompromised children, and dogs without issue. Professional-grade bait stations are placed in locations inaccessible to pets and children. If you have specific concerns about products or placement, Troy addresses those directly before any treatment begins.
Same-day service is available and well-documented across Pest Shield’s review history — multiple customers describe calling in the morning and having a technician arrive the same day, including Sundays at no extra charge. Brunswick is within Pest Shield’s Frederick County service area, and the company dispatches directly without routing calls through a call center or dispatcher. For active infestations or situations involving family members with allergies, same-day scheduling is standard. Call (301) 829-0060 to check availability.
Call Pest Shield. Under the Standard Care Plan, free retreatment between scheduled visits is included — if mouse activity reappears before your next 60-day visit, a technician comes back at no additional charge. This is part of the 100% effective guarantee, not an exception to it. Outside of the plan, Pest Shield has a documented pattern of standing behind its work: Troy has been documented returning to refresh bait stations and schedule additional visits until the problem is fully resolved, without charging extra for the follow-through.
